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LOANS HELD FOR INVESTMENT - Additional Information V (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 12,870,002		$ 12,870,002		$ 12,870,002		$ 12,746,556
Loans modified to borrowers experiencing financial difficulty	33,957	$ 118,860	36,642	$ 121,365	62,197	$ 126,308
Financing receivable that had a payment default			400	300
United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,439,250		2,439,250		2,439,250		2,294,950
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	245,350		245,350		245,350		228,396
Loans modified to borrowers experiencing financial difficulty	0	0	0	0	118	$ 0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	40,865		40,865		40,865		43,969
Commercial Portfolio Segment [Member] | Government [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	191,300		191,300		191,300		193,300
Commercial Portfolio Segment [Member] | Government [Member] | V I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	129,200		129,200		129,200		100,400
Commercial Portfolio Segment [Member] | Government [Member] | Public Corporation [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	28,900		28,900		28,900
Commercial Portfolio Segment [Member] | Government [Member] | Property Tax Revenue [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	132,200		132,200		132,200
Commercial Portfolio Segment [Member] | Government [Member] | Municipal Special Obligation Bond [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	21,500		21,500		21,500
Commercial Portfolio Segment [Member] | Government [Member] | Puerto Rico Electric Power Authority [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	8,700		8,700		8,700
Commercial Portfolio Segment [Member] | Government [Member] | Low-Income Housing Tax Credit And Community Development Block Grant-Disaster Recovery [Member] | Construction Loans [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	69,700		69,700		69,700		59,200
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,859,158		2,859,158		2,859,158		2,828,431
Residential Portfolio Segment [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	515,264		515,264		515,264		505,226
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	89,957		89,957		89,957		92,252
Loans modified to borrowers experiencing financial difficulty	1,800	$ 2,300	3,000	$ 3,800
Residential Portfolio Segment [Member] | Loans Insured or Guaranteed by US Government Authorities [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,110		1,110		1,110		1,128
Residential Portfolio Segment [Member] | Government [Member] | Puerto Rico Housing Finance Authority [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 69,800		$ 69,800		$ 69,800		$ 72,500
Product Concentration Risk [Member] | Loans and Finance Receivables [Member] | Puerto Rico [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration			77.00%
Product Concentration Risk [Member] | Loans and Finance Receivables [Member] | United States [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration			19.00%
Product Concentration Risk [Member] | Loans and Finance Receivables [Member] | USVI and BVI [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit risk concentration			4.00%

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